EP3097163A1 - A crosslinkable acrylate polymer composition - Google Patents

A crosslinkable acrylate polymer composition

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Publication number
EP3097163A1
EP3097163A1 EP15700860.8A EP15700860A EP3097163A1 EP 3097163 A1 EP3097163 A1 EP 3097163A1 EP 15700860 A EP15700860 A EP 15700860A EP 3097163 A1 EP3097163 A1 EP 3097163A1
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EP
European Patent Office
Prior art keywords
polymer
composition
crosslinkable
composition according
monomer units
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP15700860.8A
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German (de)
French (fr)
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EP3097163B1 (en
Inventor
Lily Li
Jeff Jianfeng XIA
Chunying Erin LIU
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BASF SE
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BASF SE
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Publication of EP3097163A1 publication Critical patent/EP3097163A1/en
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Publication of EP3097163B1 publication Critical patent/EP3097163B1/en
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/002—Priming paints
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
    • C08L33/04—Homopolymers or copolymers of esters
    • C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
    • C08L33/08—Homopolymers or copolymers of acrylic acid esters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
    • C08L33/24—Homopolymers or copolymers of amides or imides
    • C08L33/26—Homopolymers or copolymers of acrylamide or methacrylamide
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
    • C09D133/04—Homopolymers or copolymers of esters
    • C09D133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C09D133/08—Homopolymers or copolymers of acrylic acid esters
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/63—Additives non-macromolecular organic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04—Homopolymers or copolymers of esters
    • C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C09J133/08—Homopolymers or copolymers of acrylic acid esters
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/24—Homopolymers or copolymers of amides or imides
    • C09J133/26—Homopolymers or copolymers of acrylamide or methacrylamide
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/02—Forms or constructions
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/02—Forms or constructions
    • G09F2003/0272—Labels for containers
    • G09F2003/0273—Labels for bottles, flasks

Definitions

  • the invention relates to a crosslinkable acrylate polymer composition, a primer comprising such crosslinkable acrylate polymer composition, and use of said primer for preparing beer bottle label paper.
  • Beer bottle label paper is a kind of vacuum metallization paper which can replace laminated aluminum foil paper and reduce aluminum usage significantly.
  • the metallization primer is mainly organic solvent based system, and water based system in the market does not give good ink retention property.
  • CN101210397A disclosed a water based pre-metallization primer for vacuum metallization beer bottle label paper, its preparation method and use, wherein said primer comprises acrylic resin, acrylate resin, vinyl resin, neutralizer, water and additives.
  • said primer comprises acrylic resin, acrylate resin, vinyl resin, neutralizer, water and additives.
  • the ink retention property can be improved significantly when crosslinkable acrylate polymer composition with suitable acid number and two glass transition temperatures (Tg) is used in the water based primer, and at the same time the beer bottle label paper still remain good wash-off property, high gloss, good metallization quality, and/or good rub resistance.
  • Tg glass transition temperatures
  • the invention provides a crosslinkable acrylate polymer composition
  • a crosslinkable acrylate polymer composition comprising a first polymer having glass transition temperature (Tg) of 50 to 100°C and a second polymer having Tg of -10 to 25°C, wherein the composition has an acid number of 1-30 mg KOH/g, or the composition has an acid number of 1-39 mg KOH/g and at least one of the first polymer and the second polymer comprises 0.1-5wt% of monomer units having a crosslinkable functional group based on the weight of the composition.
  • Tg glass transition temperature
  • the invention also provides a primer comprising said crosslinkable acrylate polymer composition above.
  • the invention also provides use of said primer above for preparing beer bottle label paper. Description of drawing
  • Figure 1 shows a photograph according to one comparative embodiment.
  • Figure 2 shows a photograph according to one embodiment of the present invention.
  • Figure 3 shows a photograph according to one embodiment of the present invention.
  • Figure 4 shows a photograph according to one embodiment of the present invention.
  • Figure 5 shows a photograph according to one embodiment of the present invention.
  • Figure 6 shows a photograph according to one comparative embodiment.
  • Figure 7 shows a photograph according to one embodiment of the present invention.
  • Figure 8 shows a photograph according to one comparative embodiment.
  • Figure 9 shows a photograph according to one comparative embodiment.
  • Figure 10 shows a photograph according to one embodiment of the present invention.
  • Figure 11 shows a photograph according to one embodiment of the present invention.
  • Figure 12 shows a photograph according to one embodiment of the present invention.
  • the invention provides a crosslinkable acrylate polymer composition
  • a crosslinkable acrylate polymer composition comprising a first polymer having Tg of 50 to 100°C and a second polymer having Tg of -10 to 25°C, wherein the composition has an acid number of 1-30 mg KOH/g, or the composition has an acid number of 1-39 mg KOH/g and at least one of the first polymer and the second polymer comprises 0.1-5wt% of monomer units having a crosslinkable functional group based on the weight of the composition.
  • the composition has an acid number of 1-22 mg KOH/g, preferably 1-11 mg KOH/g.
  • crosslinkable acrylate polymer composition means crosslinkable (meth)acrylate polymer composition.
  • At least one of the first polymer and the second polymer comprises l-4wt%, preferably l-3wt% of monomer units having a crosslinkable functional group based on the weight of the composition.
  • the first polymer comprises 0.1-5wt%, preferably l-4wt%, more preferably l-3wt% of monomer units having a crosslinkable functional group based on the weight of the composition.
  • the second polymer comprises 0.1-5wt%, preferably l-4wt%, more preferably l-3wt% of monomer units having a crosslinkable functional group based on the weight of the composition.
  • both the first polymer and the second polymer comprises 0.1-5wt%, preferably l-4wt%, more preferably l-3wt% of monomer units having a crosslinkable functional group based on the weight of the composition.
  • the invention provides a crosslinkable acrylate polymer composition
  • a crosslinkable acrylate polymer composition comprising a first polymer having Tg of 50 to 100°C and a second polymer having Tg of -10 to 25°C, wherein the composition has an acid number of 1-30 mg KOH/g, or the composition has an acid number of 1-39 mg KOH/g and at least one of the first polymer and the second polymer comprises 0.1-5wt% of monomer units derived from diacetone acrylamide (DAAM), a compound with acetoacetoxy and vinyl group, or combination thereof based on the weight of the composition.
  • DAAM diacetone acrylamide
  • said compound with acetoacetoxy and vinyl group is 2-(acetoacetoxy)ethyl methacrylate.
  • the first polymer and the second polymer each independently can comprise monomer units derived from methyl acrylic acid, acrylic acid, itaconic acid, butenoic acid, pentenoic acid, or combination thereof.
  • the first polymer comprises 40-100wt% hard monomer units and 0-60wt% soft monomer units and the second polymer comprises 5-35wt% hard monomer units and 65-95wt% soft monomer units, said hard monomer units being derived from the group consisting of styrene, methyl methacrylate, alpha methyl styrene, n-butyl methacrylate and ethyl methacrylate and said soft monomer units being derived from the group consisting of butyl acrylate, 2-ethyl hexylacrylate, ethyl acrylate and n-propyl acrylate.
  • the first polymer has Tg of 50 to 80 °C, preferably 60 to 80 °C
  • the second polymer has Tg of -5 to 15 °C, preferably 0 to 10 °C.
  • the composition has a particle with particle size being 50-120nm, preferably 60-100nm, more preferably 70-90nm.
  • the content of the first polymer is 35-80wt% and the content of the second polymer is 20-65wt% based on the weight of the composition.
  • the content of the first polymer is 35-75wt% and the content of the second polymer is 25-65wt% based on the weight of the composition.
  • the composition can comprise a crosslinking agent.
  • Said crosslinking agent can be any crosslinking agent used to crosslink said composition.
  • One preferred crosslinking agent is adipoyl dihydrazide (ADH).
  • ADH adipoyl dihydrazide
  • the content of the crosslinking agent is 0-2.5wt%, preferably 0.05-2.5wt%, more preferably 0.5-2wt% based on the weight of the composition. More preferably, the content of ADH is usually half of that of DAAM.
  • the invention provides a primer comprising said crosslinkable acrylate polymer composition above.
  • the primer can further comprise an additive such as coalescent agent, defoamer, wetting agent, wax, water or mixture thereof.
  • an additive such as coalescent agent, defoamer, wetting agent, wax, water or mixture thereof.
  • the content of the additive such as coalescent agent is 0-5% based on the total weight of the primer.
  • the invention also provide a method for preparing the crosslinkable acrylate polymer composition comprising steps of mixing first polymer and second polymer.
  • said method comprises firstly forming the first polymer without further purification, and then forming the second polymer.
  • the polymerization for forming the polymers is an emulsion polymerization.
  • Said emulsion polymerization is carried out in a manner known in the art.
  • anionic emulsifier used in the emulsion polymerization can be fatty acid salts such as sodium stearate, sodium oleate and sodium laurate; alkylaryllsulfonic acid salts such as sodium dodecylbenzenesulfonate; alkyl sulfate ester salts such as sodium lauryl sulfate; alkyl sulfosuccinate ester salts such as sodium monoactyl sulfosuccinate, sodium dioctyl sulfosuccinate and sodium polyoxyethylenelauryl sulfosuccinate; polyoxyalkylene alkyl ether sulfate ester salts such as sodium polyoxyethylene lauryl ether sulfate; polyoxyalkylene alkyl ether sulf
  • Glass transition temperature (Tg) is calculated according to Linear Equation:
  • Tg (Polymer) Wt% jTgi + Wt% 2 Tg 2 + + Wt% n Tg
  • AN (mgKOH/g) (Wt% Mwi + Wt% 2 / Mw 2 + + Wt% J Mw impart )x56100
  • Wt% n is the weight content based on total monomer of each functional monomer which includes acid group
  • the particle size is measured by dynamic light scattering (DLS) particle size analyser like Malvern Nano ZS90.
  • DLS dynamic light scattering
  • aqueous sodium persulfate solution add 7.2g ammonia (20%>) below 50°C, then add 26.2g aqueous adipoyl dihydrazide solution (10%>) below 40°C, and then collect product. Its acid number is 23 mgKOH/g, Tg is 29(°C), and particle size is 78nm.
  • Two primers are prepared by using polymers according to comparative example 1 and example 1 respectively, and the primer formulation and the process are described as follows.
  • Preparation process Mix the polymer with H 2 0, then add the coalescent agent, defoamer, wetting agent respectively under stirring.
  • Step 1 Apply pre-metallisation primer on beer label paper and dry at 90°C for 30 sec wherein dry deposit is around 2g/m 2 .
  • Step 2 Metallization by HHV AUTO 306 machine, aluminum thickness is about 25nm.
  • Step 3 Apply post-metallization primer on the alumunium layer and dry at 90°C for 30 sec wherein dry deposit is around lg/m 2 .
  • Step 4 Apply gravure ink on post primer and dry at 90°C for 30 sec.
  • Step 5 Cut the label sample into 7*7 cm 2 pieces, then soak it in a 2.5% sodium hydroxide solution for 20min at 85°C to check ink retention.
  • Step 6 Test gloss of each layer by BYK glossmeter.
  • Metallization quality effect of comparative example 1 and example 1 are shown in figure 1 and figure 2, respectively. It can be seen that metallization quality according to example 1 is improved significantly compared to comparative example 1. More specifically, figure 1 shows that the surface is foggy, while figure 2 does not show foggy surface. It indicates that metallization quality effect using crosslinkable acrylate polymer composition of the invention is better than that only using single crosslinkable acrylate polymer.
  • Ink retention according to examples 2 to 4 and comparative example 2 are shown in figure 3 to 6, respectively. It was found that ink retention according to examples 2 to 4 is good and ink retention according to comparative example 2 is poor when the acid number is too high.
  • Metallization quality and gloss effect according to example 9 and comparative example 3 are shown in figure 7 and 8, respectively. It was found that metallization quality and gloss according to examples 9 show only slightly foggy on the surface, and metallization quality and gloss according to comparative example 3 show cracky on the surface.
  • Procedures of examples 10 to 12 are similar to example 1 and have similar particle size and acid number, except that they have different content of diacetone acrylamide.
  • Ink retention according to examples 10 to 12 and comparative example 4 are shown in figure 9, 10, 11 and 12, respectively. It was found that when using diacetone acrylamide, ink retention is good. When not using diacetone acrylamide, the ink retention is also good if the acid number is correct. However, if the acid number is too high, the ink retention is poor when not using diacetone acrylamide.

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  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
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Abstract

The invention relates to a crosslinkable acrylate polymer composition comprising a first polymer having Tg of 50 to 100°C and a second polymer having Tg of -10 to 25°C, wherein the composition has an acid number of 1-30 mg KOH/g, or the composition has an acid number of 1-39mg KOH/g and at least one of the first polymer and the second polymer comprises 0.1-5wt% of monomer units having a crosslinkable functional group based on the weight of the composition, and a primer prepared thereof. The invention also relates to use of said primer for preparing beer bottle label paper.

Description

A Crosslinkable Acrylate Polymer Composition
Field of the Invention
The invention relates to a crosslinkable acrylate polymer composition, a primer comprising such crosslinkable acrylate polymer composition, and use of said primer for preparing beer bottle label paper.
Description of Related Arts
Beer bottle label paper is a kind of vacuum metallization paper which can replace laminated aluminum foil paper and reduce aluminum usage significantly. Currently for returnable beer bottle label paper, the metallization primer is mainly organic solvent based system, and water based system in the market does not give good ink retention property.
CN101210397A disclosed a water based pre-metallization primer for vacuum metallization beer bottle label paper, its preparation method and use, wherein said primer comprises acrylic resin, acrylate resin, vinyl resin, neutralizer, water and additives. However, there is still a need to further improve ink retention property for returnable beer bottle label paper.
It is found that the ink retention property can be improved significantly when crosslinkable acrylate polymer composition with suitable acid number and two glass transition temperatures (Tg) is used in the water based primer, and at the same time the beer bottle label paper still remain good wash-off property, high gloss, good metallization quality, and/or good rub resistance.
Summary of the Invention
For the purpose of the invention, the invention provides a crosslinkable acrylate polymer composition comprising a first polymer having glass transition temperature (Tg) of 50 to 100°C and a second polymer having Tg of -10 to 25°C, wherein the composition has an acid number of 1-30 mg KOH/g, or the composition has an acid number of 1-39 mg KOH/g and at least one of the first polymer and the second polymer comprises 0.1-5wt% of monomer units having a crosslinkable functional group based on the weight of the composition.
The invention also provides a primer comprising said crosslinkable acrylate polymer composition above.
Furthermore, the invention also provides use of said primer above for preparing beer bottle label paper. Description of drawing
Figure 1 shows a photograph according to one comparative embodiment.
Figure 2 shows a photograph according to one embodiment of the present invention.
Figure 3 shows a photograph according to one embodiment of the present invention.
Figure 4 shows a photograph according to one embodiment of the present invention.
Figure 5 shows a photograph according to one embodiment of the present invention.
Figure 6 shows a photograph according to one comparative embodiment.
Figure 7 shows a photograph according to one embodiment of the present invention.
Figure 8 shows a photograph according to one comparative embodiment.
Figure 9 shows a photograph according to one comparative embodiment.
Figure 10 shows a photograph according to one embodiment of the present invention.
Figure 11 shows a photograph according to one embodiment of the present invention.
Figure 12 shows a photograph according to one embodiment of the present invention.
Embodiments of the Invention
Specially, the invention provides a crosslinkable acrylate polymer composition comprising a first polymer having Tg of 50 to 100°C and a second polymer having Tg of -10 to 25°C, wherein the composition has an acid number of 1-30 mg KOH/g, or the composition has an acid number of 1-39 mg KOH/g and at least one of the first polymer and the second polymer comprises 0.1-5wt% of monomer units having a crosslinkable functional group based on the weight of the composition. In one embodiment of the invention, the composition has an acid number of 1-22 mg KOH/g, preferably 1-11 mg KOH/g.
In the context of this application, the term "crosslinkable acrylate polymer composition" means crosslinkable (meth)acrylate polymer composition.
In one preferred embodiment of the invention, at least one of the first polymer and the second polymer comprises l-4wt%, preferably l-3wt% of monomer units having a crosslinkable functional group based on the weight of the composition.
In one preferred embodiment of the invention, the first polymer comprises 0.1-5wt%, preferably l-4wt%, more preferably l-3wt% of monomer units having a crosslinkable functional group based on the weight of the composition.
In another preferred embodiment of the invention, the second polymer comprises 0.1-5wt%, preferably l-4wt%, more preferably l-3wt% of monomer units having a crosslinkable functional group based on the weight of the composition. In still another preferred embodiment of the invention, both the first polymer and the second polymer comprises 0.1-5wt%, preferably l-4wt%, more preferably l-3wt% of monomer units having a crosslinkable functional group based on the weight of the composition.
In one preferred embodiment of the invention, the invention provides a crosslinkable acrylate polymer composition comprising a first polymer having Tg of 50 to 100°C and a second polymer having Tg of -10 to 25°C, wherein the composition has an acid number of 1-30 mg KOH/g, or the composition has an acid number of 1-39 mg KOH/g and at least one of the first polymer and the second polymer comprises 0.1-5wt% of monomer units derived from diacetone acrylamide (DAAM), a compound with acetoacetoxy and vinyl group, or combination thereof based on the weight of the composition. Preferably, said compound with acetoacetoxy and vinyl group is 2-(acetoacetoxy)ethyl methacrylate.
The first polymer and the second polymer each independently can comprise monomer units derived from methyl acrylic acid, acrylic acid, itaconic acid, butenoic acid, pentenoic acid, or combination thereof.
In one preferred embodiment of the invention, the first polymer comprises 40-100wt% hard monomer units and 0-60wt% soft monomer units and the second polymer comprises 5-35wt% hard monomer units and 65-95wt% soft monomer units, said hard monomer units being derived from the group consisting of styrene, methyl methacrylate, alpha methyl styrene, n-butyl methacrylate and ethyl methacrylate and said soft monomer units being derived from the group consisting of butyl acrylate, 2-ethyl hexylacrylate, ethyl acrylate and n-propyl acrylate.
Particularly, the first polymer has Tg of 50 to 80 °C, preferably 60 to 80 °C, and the second polymer has Tg of -5 to 15 °C, preferably 0 to 10 °C.
In one preferred embodiment of the invention, the composition has a particle with particle size being 50-120nm, preferably 60-100nm, more preferably 70-90nm.
In one preferred embodiment of the invention, the content of the first polymer is 35-80wt% and the content of the second polymer is 20-65wt% based on the weight of the composition. Preferably, the content of the first polymer is 35-75wt% and the content of the second polymer is 25-65wt% based on the weight of the composition.
In one preferred embodiment of the invention, the composition can comprise a crosslinking agent. Said crosslinking agent can be any crosslinking agent used to crosslink said composition. One preferred crosslinking agent is adipoyl dihydrazide (ADH). Preferably, the content of the crosslinking agent is 0-2.5wt%, preferably 0.05-2.5wt%, more preferably 0.5-2wt% based on the weight of the composition. More preferably, the content of ADH is usually half of that of DAAM. In another aspect, the invention provides a primer comprising said crosslinkable acrylate polymer composition above.
In one preferred embodiment of the invention, the primer can further comprise an additive such as coalescent agent, defoamer, wetting agent, wax, water or mixture thereof. Preferably, the content of the additive such as coalescent agent is 0-5% based on the total weight of the primer.
Use of the primer for preparing beer bottle label paper is also included in the scope of the invention.
In one embodiment of the invention, the invention also provide a method for preparing the crosslinkable acrylate polymer composition comprising steps of mixing first polymer and second polymer. Preferably, said method comprises firstly forming the first polymer without further purification, and then forming the second polymer.
In one preferred embodiment of the invention, the polymerization for forming the polymers is an emulsion polymerization. Said emulsion polymerization is carried out in a manner known in the art. Preferably, anionic emulsifier used in the emulsion polymerization can be fatty acid salts such as sodium stearate, sodium oleate and sodium laurate; alkylaryllsulfonic acid salts such as sodium dodecylbenzenesulfonate; alkyl sulfate ester salts such as sodium lauryl sulfate; alkyl sulfosuccinate ester salts such as sodium monoactyl sulfosuccinate, sodium dioctyl sulfosuccinate and sodium polyoxyethylenelauryl sulfosuccinate; polyoxyalkylene alkyl ether sulfate ester salts such as sodium polyoxyethylene lauryl ether sulfate; polyoxyalkylene alkylaryl ether sulfate ester salts such as sodium polyoxyalkylene nonylphenol ether sulfate; alkyl diphenyl ether disulfonates; etc. and the use amount of the anionic emulsifier is about 0.1-4%, preferably 0.5-3%, more preferably 1-2% based on the weight of the total monomers.
Glass transition temperature (Tg) is calculated according to Linear Equation:
Tg (Polymer) = Wt% jTgi + Wt% 2Tg2 + + Wt% nTg„
(Remark: Wt% n is the weight content of each monomer based on total monomer, Tgnis the Tg of homopolymer from each monomer, like Tg(styrene) = 100 °C. )
Acid number are calculated according to following equation:
AN (mgKOH/g) = (Wt% Mwi + Wt% 2/ Mw 2 + + Wt% J Mw„ )x56100
(Remark: Wt% n is the weight content based on total monomer of each functional monomer which includes acid group, Mwn is the equivalent mole molecular weight of each functional monomer, like Mw(Acryiic acid) = 72, Mw (iconic acid) = 65 since Itaconic acid has two carboxylic acid group)
The particle size is measured by dynamic light scattering (DLS) particle size analyser like Malvern Nano ZS90.
All percentages are mentioned by weight unless otherwise indicated.
Examples
The present invention is now further illustrated by reference to the following examples, however, the examples are used for the purpose of explanation and not intended to limit the scopes of the invention.
Comparative example 1
Charge 462.9g deionized water and 34.2g Disponil LDBS (23%) in 2 liter 4-necked flask equipped with a stirrer, nitrogen purge inlet, condenser, and additional funnels. The charge was heated to 85°C; Then feed 34.8g aqueous sodium persulfate solution (10%>) in 150 minutes, and feed monomer mixture of 134.3g n-butyl acrylate, 43.5g 2-ethyl hexyl acrylate, 239 g styrene, 4.8g Diacetone acrylamide, 13. lg acrylic acid in 150 minutes. After feeding all the monomers and initiator (i.e. the aqueous sodium persulfate solution), add 7.2g ammonia (20%>) below 50°C, then add 26.2g aqueous adipoyl dihydrazide solution (10%>) below 40°C, and then collect product. Its acid number is 23 mgKOH/g, Tg is 29(°C), and particle size is 78nm.
Example 1
Charge 462.9g deionized water and 34.2g Disponil LDBS (23%) in 2 liter 4-necked flask equipped with a stirrer, nitrogen purge inlet, condenser, and additional funnels. The charge was heated to 85°C. Then feed 34.8g aqueous sodium persulfate solution (10%>) in 150 minutes, and feed monomer mixture 1 of 134.3g n-butyl acrylate, 24.2g 2-ethyl hexyl acrylate, 73.1 g styrene, 7.2g acrylic acid in 90 minutes and monomer mixture 2 of 19.3g 2-ethyl hexyl acrylate, 165.9 g styrene, 4.8g Diacetone acrylamide, 5.9g acrylic acid in 60 minutes; After feeding all the monomers and initiator, add 7.2g ammonia (20%>) below 50°C, then add 26.2g aqueous adipoyl dihydrazide solution (10%)) below 40°C, and then collect product. Its acid number is 23 mgKOH/g, Tg & Ratio is -3/67(°C) (55%/45%, wt/wt), and particle size is 78nm. Note: said ratio of (i.e. 55%/45%, wt/wt) means a ratio of polymer derived from mixture 1 to polymer derived from mixture 2.
Preparation of primer
Two primers are prepared by using polymers according to comparative example 1 and example 1 respectively, and the primer formulation and the process are described as follows.
Primer Formula (with 30wt% non- volatile): Polymer (45wt% non-volatile) 66.6g
Coalescent agent (Dipropylene glycol mo no methyl ether) 2g
Defoamer (FoamStar SI 2292) 0.5g
Wetting agent (Hydropalat WE 3475) 0.5g
H20 30.4g
Total 100g
Preparation process: Mix the polymer with H20, then add the coalescent agent, defoamer, wetting agent respectively under stirring.
Then prepare label sample with the primer above and test ink retention and gloss according to the following process, wherein ink retention and gloss are measured according to DIN 16524-7.
Preparation of label sample
Step 1 : Apply pre-metallisation primer on beer label paper and dry at 90°C for 30 sec wherein dry deposit is around 2g/m2.
Step 2: Metallization by HHV AUTO 306 machine, aluminum thickness is about 25nm.
Step 3: Apply post-metallization primer on the alumunium layer and dry at 90°C for 30 sec wherein dry deposit is around lg/m2.
Step 4: Apply gravure ink on post primer and dry at 90°C for 30 sec.
Step 5: Cut the label sample into 7*7 cm2 pieces, then soak it in a 2.5% sodium hydroxide solution for 20min at 85°C to check ink retention.
Step 6: Test gloss of each layer by BYK glossmeter.
Metallization quality effect of comparative example 1 and example 1 are shown in figure 1 and figure 2, respectively. It can be seen that metallization quality according to example 1 is improved significantly compared to comparative example 1. More specifically, figure 1 shows that the surface is foggy, while figure 2 does not show foggy surface. It indicates that metallization quality effect using crosslinkable acrylate polymer composition of the invention is better than that only using single crosslinkable acrylate polymer.
Examples 2 to 4 and comparative example 2
Procedure of examples 2 to 4 and comparative example 2 are similar to example 1 , except that they have different acid numbers. „
Table 1 Effect of acid number on ink retention
Ink retention according to examples 2 to 4 and comparative example 2 are shown in figure 3 to 6, respectively. It was found that ink retention according to examples 2 to 4 is good and ink retention according to comparative example 2 is poor when the acid number is too high.
Examples 5 to 8
Procedures of examples 5 to 8 are similar to example 1 , except that they have different particle sizes.
Table 2 Effect of particle size on gloss
It can be seen that the present examples show excellent gloss.
Examples 9 and comparative example 3
Procedures of examples 9 and comparative example 3 are similar to example 1, except that they have different Tg and composition.
Table 3 Effect of Tg/composition on metallization quality and gloss
Example 9 Comparative example 3
Calculated Tg (°C) & Ratio of
0°C/55°C (35wt%/65wt%) 0°C/53°C (20wt%/80wt%) polymer composition
After pre-metallization
63 14.7
primer (60°)
Gloss
After metallization
110 56.3 _
o
Metallization quality and gloss effect according to example 9 and comparative example 3 are shown in figure 7 and 8, respectively. It was found that metallization quality and gloss according to examples 9 show only slightly foggy on the surface, and metallization quality and gloss according to comparative example 3 show cracky on the surface.
Examples 10 to 12 and Comparative example 4
Procedures of examples 10 to 12 are similar to example 1 and have similar particle size and acid number, except that they have different content of diacetone acrylamide.
Table 4 Effect of diacetone acrylamide (i.e. monomer for forming crosslinkable group) content on ink retention
Ink retention according to examples 10 to 12 and comparative example 4 are shown in figure 9, 10, 11 and 12, respectively. It was found that when using diacetone acrylamide, ink retention is good. When not using diacetone acrylamide, the ink retention is also good if the acid number is correct. However, if the acid number is too high, the ink retention is poor when not using diacetone acrylamide.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope or spirit of the invention. Thus, it is intended that the present invention cover such modifications and variations as come within the scope of the appended claims and their equivalents.

Claims

Claims
1. A crosslinkable acrylate polymer composition comprising a first polymer having Tg of 50 to 100°C and a second polymer having Tg of -10 to 25°C, wherein the composition has an acid number of 1-30 mg KOH/g, or the composition has an acid number of 1-39 mg KOH/g and at least one of the first polymer and the second polymer comprises 0.1-5wt% of monomer units having a crosslinkable functional group based on the weight of the composition.
2. The crosslinkable acrylate polymer composition according to claim 1 wherein the composition has an acid number of 1-22 mg KOH/g.
3. The crosslinkable acrylate polymer composition according to claim 1 wherein the composition has an acid number of 1-11 mg KOH/g.
4. The crosslinkable acrylate polymer composition according to claim 1 wherein at least one of the first polymer and the second polymer comprises l-4wt% of monomer units having a crosslinkable functional group based on the weight of the composition.
5. The crosslinkable acrylate polymer composition according to claim 1 wherein at least one of the first polymer and the second polymer comprises l-3wt% of monomer units having a crosslinkable functional group based on the weight of the composition.
6. The crosslinkable acrylate polymer composition according to any one of claims 1 to 5 wherein the monomer units are derived from diacetone acrylamide, a compound with acetoacetoxy and vinyl group, or combination thereof.
7. The crosslinkable acrylate polymer composition according to claim 6 wherein the compound with acetoacetoxy and vinyl group is 2-(acetoacetoxy)ethyl methacrylate.
8. The crosslinkable acrylate polymer composition according to any one of claims 1 to 7 wherein the first polymer and the second polymer each independently comprises monomer units derived from methyl acrylic acid, acrylic acid, itaconic acid, butenoic acid, pentenoic acid, or combination thereof.
9. The crosslinkable acrylate polymer composition according to any one of claims 1 to 8 wherein the first polymer comprises 40-100wt% hard monomer units and 0-60wt% soft monomer units and the second polymer comprises 5-35wt% hard monomer units and 65-95wt% soft monomer units, said hard monomer units being derived from the group consisting of styrene, methyl methacrylate, alpha methyl styrene, n-butyl methacrylate and ethyl methacrylate and said soft monomer units being derived from the group consisting of butyl acrylate, 2-ethyl hexylacrylate, ethyl acrylate and n-propyl acrylate.
10. The crosslinkable acrylate polymer composition according to any one of claims 1 to 9 wherein the first polymer has Tg of 50 to 80 °C, preferably 60 to 80 °C.
11. The crosslinkable acrylate polymer composition according to any one of claims 1 to 10 wherein the second polymer has Tg of -5 to 15 °C, preferably 0 to 10 °C.
12. The crosslinkable acrylate polymer composition according to any one of claims 1 to 11 wherein the composition has a particle with particle size of 50-120nm, preferably 60-100nm, more preferably 70-90nm.
13. The crosslinkable acrylate polymer composition according to any one of claims 1 to 12 wherein the content of the first polymer is 35-80wt% and the content of the second polymer is 20-65wt% based on the weight of the composition.
14. The crosslinkable acrylate polymer composition according to claim 13 wherein the content of the first polymer is 35-75wt% and the content of the second polymer is 25-65wt% based on the weight of the composition.
15. The crosslinkable acrylate polymer composition according to any one of claims 1 to 14 wherein the composition comprises a crosslinking agent.
16. The crosslinkable acrylate polymer composition according to claim 15 wherein the content of the crosslinking agent is 0.05-2.5wt% based on the weight of the composition.
17. A primer comprising a crosslinkable acrylate polymer composition according to any one of claims 1 to 16.
18. The primer according to claim 17 wherein the primer further comprises coalescent agent, defoamer, wetting agent, wax, water or mixture thereof.
19. The primer according to claim 18 wherein the content of the coalescent agent is 0-5% based on the total weight of the primer.
20. Use of the primer according to any one of claims 17 to 19 for preparing beer bottle label paper.
EP15700860.8A 2014-01-22 2015-01-19 A crosslinkable acrylate polymer composition Active EP3097163B1 (en)

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